Nekroscale
Nekroscale is a World Boss — a bone dragon. It appears on a scheduled event in the Shadow Realm (around 2196, 1769).
Entry
Enter the arena through the gate while the event is active. You need an active Attunement Crystal (7-day attunement). The first entry consumes the attunement. Maximum 30 participants. After the event window closes, attuned / registered players still have 15 minutes to enter.
Combat
Base HP is 30,000 × 2 iterations (effectively around 60,000 at default scaling). Larger raids increase HP further. Most resistances are high; weaker vs air and silver.
At least 4 living players in the arena, or banish. During many casts the boss is on the anchor and invulnerable. No summoned minions — AOE, marks, and hazards only.
6 phases (2 abilities each, picked at random). Damage is mostly draining.
Rewards are not taken from the corpse (noloot); each participant gets a bag of rewards (bank / backpack). Typically a large amount of gold, Elixir of Great Knowledge, reagents / necro reagents, magic gear, maps, crafting materials, and occasionally rarer specialties. Paperdoll at 100 kills.